Seamless can and a method of producing the same
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Claims
1. A seamless can obtained by forming a laminated material of a metal and a polyester film into a cup such that a final draw ratio defined by H/D, where H is equal to said can's height and D is equal to the diameter of said can's bottom portion, is not smaller than 1.5, wherein a polyester (A) on the bottom portion of the can has a biaxial orientation degree Rx defined by the following formula,
2. A seamless can according to claim 1, wherein said polyester (A) has a crystallinity (X) of from 10 to 70% on the bottom portion and said polyester (B) has a crystallinity (X) of from 10 to 70% on the barrel portion.
3. A seamless can according to claim 1, wherein said polyesters (A) and (B) are a copolymerized polyester having a melting point of from 210.degree. to 252.degree. C.
4. A seamless can obtained by forming a laminated material of a metal and a polyester film into a cup such that a final draw ratio defined by H/D, where H is equal to said can's height and D is equal to the diameter of said can's bottom portion, is not smaller than 1.5, wherein a polyester (A) on the bottom portion of the can has a biaxial orientation degree R.sub.X defined by the following formula
Type: Grant
Filed: Feb 2, 1995
Date of Patent: Dec 23, 1997
Assignee: Toyo Seikan Kaisha, Ltd. (Tokyo)
Inventors: Akira Kobayashi (Chigasaki), Hideo Kurashima (Yokosuka), Harumi Sato (Yokohama), Satoshi Fujita (Yokohama), Katsuhiro Imazu (Yokohama)
Primary Examiner: Rena Dye
Law Firm: Sughrue,Mion,Zinn,Macpeak & Seas, PLLC
Application Number: 8/382,639
International Classification: B32B 1508; B65D 9004;